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Nearly a third of Prague residential fund is represented by prefab houses built in the second half of 20th century. Indoor environment quality in those houses does not meet current standards in many cases. Refurbishments in the past were mainly focused on reducing thermal losses in winter with insufficient attention to air ventilation or summer overheating. The article deals with a significant problem of high indoor temperatures during summer period present in G40 prefab houses. It evaluates an influence of severa...

A long term EU effort is to reduce CO2 emissions in order to stabilize climatic changes. Reducing buildings energy consumption is a necessary step to achieve this goal. Since 2020 all new buildings in Czech Republic must be designed as nearly zero energy. It sets low energy consumption requirements as well as requirements on indoor environment quality. However one third of residential buildings in Czech Republic was built before the year 1945 and does not meet these demands. Refurbishments of these buildings shoul...